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UnityOne Modular Fiber/Copper ZPHA Installation Guide V 2.1 15
When you have a straight cable coming in, you can use two straight cables. If both connected devices
are end devices, you should use two cross-over cables. This is because when the ZPHA closes there
must be a crossover between the two connected devices. Without having the two crossover cables on
one side both cables between the two connected devices upon failure would be straight through and the
connection would not complete. See Figure 2 - 11, “
ZPHA Cross-over Configuration 2:
If you have two end devices connected with two cross-over connections, you should configure the
cables as follows:
• One side must have a crossover cable between the IPS and ZPHA devices with a straight through
cable between the ZPHA and the connected device
• The other side should have a reversed setting with the cross-over cable connecting the ZPHA and the
other device
Figure 2 - 11: ZPHA Cross-over Configuration 2